A structure and top cover for preventing external short circuit of battery

Abstract

The invention belongs to the technical field of battery production, and in particular relates to a structure for preventing external short circuit of the battery, comprising an insulating plate (1) and a conductive part (2), and the conductive part (2) is arranged on the insulating plate (1) On the top and / or bottom surface, the conductive part (2) is connected with a fuse line (3), the insulating plate (1) is provided with a conductive hole (10), and the fuse line (3) passes through the conductive hole ( 10) Attach the solder ring (7) or top cover (5) of the battery. The invention can automatically cut off the current between the pole and the top cover, avoid the external parts and the shell from forming a large current, and improve the safety performance of the battery core. At the same time, it has the advantages of small size and light weight, and the production process is mature, which is beneficial to reduce manufacturing cost. In addition, the invention also discloses a top cover.

Description

technical field [0001] The invention belongs to the technical field of battery production, and in particular relates to a structure and a top cover for preventing external short circuit of the battery. Background technique [0002] Nowadays, all countries are vigorously developing green and high-efficiency secondary batteries. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, and environmental protection. At the same time, with the development of modern society With the development and the enhancement of people's awareness of environmental protection, more and more devices choose to use lithium batteries as power sources, such as mobile phones, notebook computers, power tools and electric vehicles, etc., which provides a broad space for the application and development of lithium batteries. [0003] However, during the use of lit...

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Problems solved by technology

[0003] However, during the use of lithium batteries, excessive current in the lithium battery can easily lead to damage to the lithium battery, and continuous charging with excessive current can easily cause the life of the lithium battery to be reduced, and more seriously, it will cause the lithium battery to explode. Dangerous accidents, at present, the positive pole is electrically connected to the top cover sheet through a resistance block, wherein the resistance of the resistance block is at the milliohm level

The inventor found that there are certain risks in this structure: first, the mass of the resistance block is relatively large, and the production cost is relatively high; The current between the columns reduces the safety performance of the battery cell

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